Curtains and lighting
Shelves separate the space
Curtain across the whole nook
Back to back identical headboards
Drawer unit window seat
Bunks with solid headboard creates nook
Headboard/bookcase to separate space
Corner padded headboard
Two canopy beds for privacy
Bunk beds, headboards meet above adult bed below.
Double bookshelf between twin beds
Two queens instead of bunks? Look too much like a hotel?
Little round table in between
Narrow wardrobe with curtains instead of doors. Near widow creates windows seat bench nook.
End to end with storage under. 2 captain beds?
Add archway to end of room to make nook over two captain beds
Nook with udder bed storage, bookcase and lights
Separate queen bed with arch